This is an impossible questions and a poor metric to ask. As of this writing (January 2012), we have over 1700 signature samples, but we can detect variants and families, and detect from individual components of malware families from these signatures as well, so detection signatures vs.how many malware types can be detected do not necessarily correlate.Obviously, we update our database and provide it to your device regularly, so the figures mentioned here will change rapidly over time.